EFX
| Acronym | Definition |
|---|---|
| EFX | Effects (as in motion picture special effects; sometimes just FX) |
| EFX | Effects |
| EFX | Enhanced Effects |
| EFX | Elliptical Fitness Crosstrainer |
| EFX | Elite Force Xtreme (gaming) |
| EFX | Expeditionary Force Experiment |
| EFX | Efficient XML |
| EFX | Expeditionary Force Exercise |
| EFX | Elite Force Expansion (Star Trek Voyager) |
| EFX | Emitter File Index |
| EFX | Electronic Fax Document (file extension) |